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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '656af697d8e08f4971b15c7512416e37c808090fa82a155daf4e60c691febc68' 
  AND token = 'cHGv6amQ5BvqE+fzHAueC6BIRPtQQkC/n4vN09J2HP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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