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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b18c1872bcbc649f7b8386087c34289c9bffb19a80858eb7338cc8f53c18cd' 
  AND token = 'VEeBrFvF4DrJHUjVXVmiEtb99eiPv/aGEuI1oknVKMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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