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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48cdfebb2e2ae4f967cef8484d846d93d4aed19268a8ef3f2b44d7c916259e32' 
  AND token = 'zkj2qQfG/JaInkCj+k+jao1SUPJum992KgpLRbuiAi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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