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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4fc9a5d641f8dc90f4dfe4da8e5ac856a73ae53de042e2d3f859ba167b5eb6c' 
  AND token = 'FrShh+VsE939vxXfftl5c16pGwySzsL1UCDb8lr3R0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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