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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0d709a03fbe784ccb2af8fa7c44d9a56a0a25cdf66718b78fd9ae8cc9c1eab' 
  AND token = 'yjvlG4asTg+0nnGWAPhYOSJ1SQHTSGn55tXAhOBq97c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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