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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94cb5e68be390a12bac4ae9f7a3c9ad9f6633bfd0cc14d8fe8249ce8d4e32ea7' 
  AND token = 'bDc/L3hEA4WlWmQPDo7cL3b9is5NltpIYjDyaLSZwVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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