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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5352ee8032b55e0914c0dfb509e45ceb41fe0cd6335c3625093ca64b6d17b559' 
  AND token = 'M2oLdvLKc0+6q3/kzCDrGgF+knXtfmPqxYMr7ufQ0dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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