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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ea16a362335011bbb4ce39675557d10c8bd0aecb810957a6c772a6d97b2c06' 
  AND token = '7O5iDH3VEGE87EbDHk98B+cIIELmwDuRR8nDSlKKVPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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