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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a23e3fcedb558e33f1f4e10f467ef485ec11c5aa5a1e8df72a74f8e31a8f47' 
  AND token = 'jk4dDVr4bzInpa9xL7HPKI8K/C7Q/4esmuaJ/W6yc48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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