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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f6e40f675cdb1d6532d547b026a9912a4f9cfd8035fa7d6bbecfe306204169' 
  AND token = 'n/3sxuRfOB2mpR+AP1TjSYGc1vWQK79rEOAm2iKlN3U=' 
  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"
    }
  }
}