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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414e0dbb9f6f51db663c101fd1c06ae337bfb106d128f8a125e9c5b6792db64e' 
  AND token = 'R5GNS0MaBkrqRQBRwLKIiNtqfncNYXrAzTqY7bs59Xs=' 
  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"
    }
  }
}