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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '465d08535109a9421b9e32d4a00eac469138502877b97c8f14401892a0fef907' 
  AND token = 'lCSkcHR9jl8TLHRpJTrSXMDIQOLMnBc5xeIDq5XQxU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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