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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd11cffb0e367ae85370e7d16b3f90695bf5686e32e5bcfc88e16194bd9c3bf' 
  AND token = '+4YBOBZKZiT3dWXB7UpTx8OZXZRf0sktVDV45zsGOIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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