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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b56c43b52015af18d2e53eadae6bb1354ff919ec2dc11f154448ca89c1cbb8' 
  AND token = '9Bk+vGvNkyKR1wsp8nYDgF+JuslTMdl17d+g1ayfBaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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