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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e15053625c0a8f18d9b13ed5dbcd1f7afcc7d244c2f0d2ce13c6c3a64631f82' 
  AND token = 'ClcUoGbnKJS50xhnfE8jAzQ4dtQ/+Im5SgY1iHDT7ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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