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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e991761972605db31d5ca995f00ff1d28f2c8dc3f59038092e61e6ba5e417c9' 
  AND token = '4s+7nELcrRoeiXb1JcAC9GjNmIZXFpnkEf7/zTVVmlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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