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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ae7c9ad70698ccd695ba804da43ceea18bd2869599bca576b26bd4b2a23a05' 
  AND token = '+kJFoL4LdKh8Ov0nINzWMqvE+46RKejyRS3ke7YKIp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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