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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d3cd7401473046a305b3d6886face06ddee999c0b41c157297c30d160b08b5' 
  AND token = 'uKK8oYLBU4fjgs73dyJS0DJPOlKVMTUTTku9dz1ErCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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