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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd9e09321ba34504708d11f1e017c80ec11d6c2f9d80050a12eec9b24acca11' 
  AND token = 'P3d8ulo1u+uXReWHjZfuJr2uKMBY4oTa35+HHgFtV70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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