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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7c7d7cb1d185ad1d241c5b2c77eae029fe28223e7faeb390b7c54d05805b5d' 
  AND token = '0/P0mgOEVYNA21Z8trX6TN9Fuf6UQuIRJqkdce+yK+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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