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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26bd43253b08383dcfbaf8a9b89d53d1f29cea0fb4e7c382712072d7ab44215' 
  AND token = 'QQW2wca0rHBG8Ii6f9AP8MDHQglA6lBso5sk6I4eFr0=' 
  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"
    }
  }
}