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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6102e93fecbdee8b0d29da8d2fa777925e5242487fdca55bf029e98b0f96b5' 
  AND token = 'sL5PxvEW5Pq+bB+ZO0FERvZErIEQh7NegXwvja3R+EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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