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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a073732e12e81e217e8615e083059170f26a9e6f4b6f1ea1356a3bb44d6edaac' 
  AND token = 'TXFalx2nKYaJA6y7VJ7L1T6gK3aG9OYdZIvMMGeb3WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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