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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9017eccb978632d59ef55cd39e23fa7afc5faae933987479aa79f74d58f7cbbc' 
  AND token = 'mPBu2bQmd0TT9mwyk+5X3Dl+EIk3I3ZN8y4uxQevdl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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