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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7f3c7422f7822a7b77aba2234b56b0f1371095ad62b03ae06f51e96f0666c2' 
  AND token = 'qlrQthriKnDFOmvnbH9P4c11bQPo9iGTnEz6jOlz5nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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