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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b76e0e97866f0c5cf107ff1aaaa78e58dff0e55257e67148dbdd7fd70abafa' 
  AND token = 'qL2nL9QtRgWDwy2XxC0eC1dd0O/OPXkbwa24LFP+JtQ=' 
  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"
    }
  }
}