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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000d32b8c77a3fbd7e0cd14e6b1d9ab0c1051e77de13db5da83bca999913bfa8' 
  AND token = 'sletbshwtTECpJNwhJGPX8Gx3V3zaLjh612DYJuPu/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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