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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a7529876479c07f60468a2cc94e7fbabc35acfe667ab1b16e9f53a09421f79d' 
  AND token = 'q6UGNsiTCBpFojsipIJD/v7GgCAi6+yQd0qcuWOEi1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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