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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d034aa46af4006b6e054c1cbbf5dce5c068f0b606ec1f9d1d0a014da9f77ee1' 
  AND token = '39+v7sGNfT05nmP3s+PhLXxQq9sqAoHWVwGlJL+hfuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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