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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4409a3605b40985b509bd49f51005e5f6f628666796bc2cf6f7a4368d09edfef' 
  AND token = '5gHjA6LDwKBo37gEmJHc4LgleWDwqMJu8ck8BriG/+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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