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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd2d2380b8f24f3a93f6fea3ff8dc4269a84322462cc8d174bfd614fa65d7a8' 
  AND token = 'Aw0ZuFj3ACdaWX7NNA9fhXUj1b3gslg8b9suSNcATko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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