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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08eb4f260ace77916dcd7f2d7e575d76c0d573db2e6d1f82a4c81599c3ccad5' 
  AND token = 'oVdSoB6O1eczL+HJysNUkSvyVYgCQiauGUqQACxrFps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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