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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca53ef33882285c0aa081d5072a747b50acaf692b030369c8240c615d0484177' 
  AND token = 'Z2Q8lNVm+vG3VUEcYngYN/ENs7p2KAHT+EQKaFTwRZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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