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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e46d807d3b3de989833db04a47f5f862df61f0ad364d3d8fbaace571343d02b8' 
  AND token = 'qbKUqbWQZmcPJlnLlyUY8W7KkMx1o7XIKfd1d5iTQwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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