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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62f3a426b465bd5374b760dbde7bd16ffe25406e5a36cec4d49b2c696b0f1e3' 
  AND token = 'JENDUMdSeCmk9+zIVwXM8kzXccCEdOe18LP8d2ilJAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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