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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1948967d9c4a23c838ce9fc1cad2bbfc7dd95d943f1901c662ba5fac27f425c7' 
  AND token = 'V/OcsVjfng06El23OFOfDOt9B4Z95Vs4OqPCcDRjSoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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