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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef8fe909c2c3aa4188818e4eb329eeafee1df3514af8f0ee8de890494e66bde3' 
  AND token = 'q+op0j/qW4ZrdkBkjVpbRPaH4y4Cay9WtLtIdaBtlvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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