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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ad9a04e5850201d8a348a5d3d5a0f697ff23a2092a0b16c30e0e69123752cf' 
  AND token = 'R7rrySjpjhGV820yBKXdfRjDL3BbsiU0GVK4ILulfi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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