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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d9217bd0c64fa0c236b1234660fd5ed768cbb8f7a3c4d44d525e958137221e' 
  AND token = '6FkEnA75vj57QyNkxGpHd8IwXcXpGV1yblt9rtLz3AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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