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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396c7cc0a7293265e4ad6f43debaba2e52e32c5b2ea1ac58c69a0db445800d9d' 
  AND token = 'OV2hl/qeSlkuVBGpTQHqBqCxBuyY4nYC+fGlaheHmJs=' 
  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"
    }
  }
}