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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39fff3f8e2058953a54014a4a746bfbc550b888629e80681b2188abad29eedce' 
  AND token = 'AzfokESu/QldL2qqRE7kC+c/4dwAtCLfs9kEeNJiYaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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