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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd57e0790338bec5f32445b8b7e44fe1c16ae141998837bd1f49b84f158a0e3' 
  AND token = 'zsYjsnBkY0sP7lXaiTG5tClSr9BBNVw+T3mlUWBN1bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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