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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f23806ca3bcdeccbddc6edd2dca4d6246a6f95fb1fa11cdc7e66351cd9f2a4' 
  AND token = 'Af22dpHt8CdawgrpyQkPG23Y7h0K6Kl4f+nWiYRCRds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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