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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fdaf3c54a1b2b66b93a7faba359143d83499263a409dd7090fe569a1e06cbca' 
  AND token = 'qZdox7vM9WxgHAMsaP74GmF/UHfVPuZqnb3FRwQExeM=' 
  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"
    }
  }
}