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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25362f3c0f45832772f5c44f8f9cb70140a436bbaa6c7693d8a988c12d83f00b' 
  AND token = 'M3DhqsoTba0RwApjk3cbdNSgozR/EJ0ElXSLIQohCtQ=' 
  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"
    }
  }
}