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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e6daf6cdcdce47b47eb5795b89160dbb29a1228e165bf6437765b7fdb6c80c9' 
  AND token = 'SiW52s416LrYPUnpd5/do7zknh/DN1kKR6F6XrW5BJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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