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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed6409c26ab4f321adb61f26ec09dcf2f9356e135b67719ad936e3452f2b6d1' 
  AND token = '/OxiZ+nf3IbLaViMfdjOc8MuhvGPk+iLh0hnRMqeh4s=' 
  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"
    }
  }
}