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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41487a07f22f805661959d3bac6a0700522813167ad43233c4e5bc8e98a7174d' 
  AND token = '+YMJipaCiDtZzBFLHJJ7TExa1BHmwPpAkp8BeSUCV+c=' 
  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"
    }
  }
}