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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f0f4fc52e234104a59b75d8606f805fb68489310a5ec5e236047b0dd4f3e8ee' 
  AND token = 'QTfXepRs/BwN99BChzLj6OCwfME2f92Pr5OCLZdkN94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}