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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c156f1275d2280bf4317dd90b99c6063d31f3f4a53e79bd99fd2b89f41c06d63' 
  AND token = 'Wt23h9BpS3L+1kbo3nQ+v4CkmGlp/gTsD9m15mKmHGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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