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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fa64dca2e953a845a7431c48837c5c705e5e25ee8bb92bf63754036df58e7e' 
  AND token = 'zn9KnbRrDWoyDBc/s21Pff5cEmR1nbtLJrqlaGs3Z5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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