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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46d106a8a879f3b5d617b3f05dbb759f000e2297a554fd7fb9e490d163f1273c' 
  AND token = 'ilWFn9fDgV2yMt6crhMd7XfY8s/jKeHIknX2O7w0j28=' 
  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"
    }
  }
}