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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '160f17db5ddc5288ad4ab2ba15513f1e8e5c64afa740027a8aa0e05759fc58ab' 
  AND token = 'xEhlbCZEMyLdll/tTC9eBg3PCzzjloul2SCGWh8Clpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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