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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd39d76f92d8c335fe83dc8f027443e2baa08f6d601a19559cda58b94c91b5bd1' 
  AND token = 'BAOi2+Csl4pQVJkpn7LoeL+FcMAb5dfSKVOXNnuPHVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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