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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ce4170fec874f36a7af6db432988280cfb9c9bf8a4f7a18d896d01d5548216' 
  AND token = 'pWOGQp6y1Sdc7qFhTms6X9opkaBAnrEphKMTRNVEF8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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